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/* This file is part of the KDE project
* Copyright (c) 2009 Jan Hambrecht <jaham@gmx.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "OffsetEffect.h"
#include "KoFilterEffectRenderContext.h"
#include "KoFilterEffectLoadingContext.h"
#include "KoViewConverter.h"
#include "KoXmlWriter.h"
#include "KoXmlReader.h"
#include <klocalizedstring.h>
#include <QPainter>
OffsetEffect::OffsetEffect()
: KoFilterEffect(OffsetEffectId, i18n("Offset"))
, m_offset(0, 0)
{
}
QPointF OffsetEffect::offset() const
{
return m_offset;
}
void OffsetEffect::setOffset(const QPointF &offset)
{
m_offset = offset;
}
QImage OffsetEffect::processImage(const QImage &image, const KoFilterEffectRenderContext &context) const
{
if (m_offset.x() == 0.0 && m_offset.y() == 0.0)
return image;
// transform from bounding box coordinates
QPointF offset = context.toUserSpace(m_offset);
// transform to view coordinates
offset = context.viewConverter()->documentToView(offset);
QImage result(image.size(), image.format());
result.fill(qRgba(0, 0, 0, 0));
QPainter p(&result);
p.drawImage(context.filterRegion().topLeft() + offset, image, context.filterRegion());
return result;
}
bool OffsetEffect::load(const KoXmlElement &element, const KoFilterEffectLoadingContext &context)
{
if (element.tagName() != id())
return false;
if (element.hasAttribute("dx"))
m_offset.rx() = element.attribute("dx").toDouble();
if (element.hasAttribute("dy"))
m_offset.ry() = element.attribute("dy").toDouble();
m_offset = context.convertFilterPrimitiveUnits(m_offset);
return true;
}
void OffsetEffect::save(KoXmlWriter &writer)
{
writer.startElement(OffsetEffectId);
saveCommonAttributes(writer);
if (m_offset.x() != 0.0)
writer.addAttribute("dx", m_offset.x());
if (m_offset.y() != 0.0)
writer.addAttribute("dy", m_offset.x());
writer.endElement();
}
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